Temperature-Controlled Synthesis of Metal-Organic Coordination Polymers: Crystal Structure, Supramolecular Isomerism, and Porous Property

Five new supramolecular metal-organic coordination polymers (MOCPs), {[Ni(bipy) (H2O)4](2,6-nds)·4H2O} (1), {[Ni(bipy)(H2O)4](2,6-nds)·2H2O} (2), {[Ni (bipy)(H2O)4](2,6-nds)} (3), {[Ni (bipy)(H2O)4](2,6-nds)} (4), {[Cu (bipy)(H2O)4](2,6-nds)} (5) (bipy = 4,4′-bipyridyl; 2,6-nds = 2,6-naphthalenedisulphonate) have been synthesized and structurally characterized. Compounds 1 and 5 were synthesized at room temperature in H2O/EtOH medium, whereas 2−4 were isolated under hydrothermal conditions. Compounds 1−4 were synthesized maintaining the same stoichiometric ratio of metal and ligand under different reaction temperatures, and the different structures of the compounds indicate that the temperature plays a significant role in the construction of the coordination polymers. Structural characterization reveals that the one-dimensional [M(bipy)(H2O)4]2+ cationic chain is a basic building unit for all of the MOCPs, while 2,6-nds remains as a counteranion. In all cases, 2,6-nds counteranions interact with water and...